Comptes Rendus Chimie · 2013 · 10 citations · 31 references
Natural SciencesChemistryMaterials ScienceCatalysisInorganic ChemistryNanomaterialsCatalyst CharacterizationCatalyst PreparationCatalyst SynthesisCatalytic MaterialsSinteringSurface CatalysisCatalytic NanomaterialsCo OxidationMetal CatalystsMetal Oxide CatalystsNanoparticle CatalystsNanostructured CatalystsOxidationPhysisorption
Four types of SBA-15 were prepared with different times and temperatures of treatment in order to obtain a range of micropore sizes. CO oxidation was used as a probe reaction in order to evaluate the nature of the active species when SBA-15s were doped with ca 10% Ag deposited from an AgNO 3 solution and calcined or reduced at 350 °C. The texture (TEM, nitrogen physisorption), structure (XRD) and reducibility (TPR) of the various catalysts (Ag/SBA-15) were studied and compared to those of a catalyst prepared by deposition of silver on fumed silica as a reference. These catalysts differ initially by the nature of silica and by pore sizes. In CO oxidation, pre-reduced catalysts are more active than pre-oxidised ones. This has to do with two phenomena, i.e. sintering, which produces large inactive silver particles, and formation of active silver species in the form of small Ag 2 O particles.
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Triblock Copolymer Syntheses of Mesoporous Silica with Periodic 50 to 300 Angstrom Pores
Dongyuan Zhao, Jianglin Feng, Qisheng Huo et al. · Science · 1998 · 11.6K citations
Generalized syntheses of large-pore mesoporous metal oxides with semicrystalline frameworks
Peidong Yang, Dongyuan Zhao, David I. Margolese et al. · Nature · 1998 · 2.5K citations